The first responsibility of the dental surgeon is for the patients teeth, and observations made at the Cleft Palate Clinic revealed many features relating to the teeth that required further investigation. This study was undertaken as an investigation into the abnormalities of number, form, and structure of the teeth in a group of children with cleft palate. As a result of this study it was hoped that a more complete picture would emerge of the abnormalities of the teeth in children with cleft palate, including the relationship of such abnormalities with the development defects and environmental upsets found in these patients. The study is not concerned with the skeletal and occlusal deformities which may frequently be associated with cleft palate.